Automobile-theft alarm.



H. B. ALEXANDER. AUTOMOBILE THEFT ALARM.

APPLICATION HLED sEPT.11,1914.

2 SHEETS-SHEET I.

12116111811 sept. 26; 1916.

H. B. ALEXANDER. AUTOMOBILE THEFT ALAR APPucATloN HLED sEPT. 1|. 1914.

Pa'tentd Sept. 26, 1916.

Llagzi 2 SHEETS-SHEET- 2.

HNRY B. ALExANDiaoF sr. LOUIS, MIssoUnI.

UTOMOBILE-THEFT ALARM.

Specifiptipn of Letters Patent.

Patented Sept. 26, 1916.

Application filed September 11, 1914. Serial-No. 861,219.=

To all 'witam it may concern:

Be it known that I, HENRY B. ALnXAN- DER, a. citizen of the United'States, and resident of St. Louis, Missouri, have invented certain new and useful Improvements' in Automobile-Theft Alarms, of which the following is a specification containing a full, clear, and exact description, reference'being had to the accompanying drawings, forming a part hereof.

My invention relates to improvements in automobile theft alarms, and the object lof my invention is to construct a simple means, arra-nged to be installed ona vehicle, such as an automobile, which Will sound an alarm when the vehicle is set in motion'by an un-` authorized person.

With the above object lin View, my inven- 'tlen consists in certain novel details of construction and arrangement of parts, hereinafter fully described, pointed out in my claim, and illustrated by the accompanying drawings, in which F igure 1 is a diagrammatical elevatio'n of the alarm, the parts of which being ar- 'ranged for use on an automobile, which is shown in dot-ted lines; Fig. 2 is a fragmental elevation, partly in section, showing the movable switch in position to be engaged by a point on one of the automobile Wheels; F ig. 3 is an enlarged sectional plan of the switch, a portion of the arm being broken away; Fig. et is a. Vertical, sectional elevation of the switch; Fig. 5 is an enlarged csectional elevation of the wheel ring showing the spring actuated point for engagement with theswitch arm; Fig. is a front sectionall ele'vation of the looking means for holding the switch to its operative position; and Fig. 7 is a Vertical sectional elevation of the lock.

Referring by numerals to the accompanying drawings: 8 designates 'the bottom of the automobile body, 9 the riser of the for- Ward or driverls seat, and 10 one of the Wheels of the automobile. Secured to and vdepending from the bottom 8 of the automobile body is a pair of brackets 11 and 12,

the bracket 11 terminating in a perforated` ear 13 for the pivotal support of a levenll,

which pivotally supports a rod 15 at its'for- Ward end, and the bracket 12 terminating in a sleeve 16 which slidably supports the rod 15 at its rear end.

17 designates a bracket secured to the riser 9 of the forward seat of the vehicle arranged for the pivotal support of a lever 18, the lowermost arm of which is pivotally connected With the uppermost arm of the lever 111.

19 designates a push-rod, which is pivotally connected with the uppermost arm of the lever 18 and which is extended through the riser 9, this push-rod being acted upon a coil spring 20 to normally hold it atv lts forward limit of movement.-

21 designates a lock having a key 22 for the operation of theI spring-boli*I 23, which serves as a means, When engaging a notch in thepush-rod, for holding the push-rod 19 inwardly against the tension of the spring 20.v

At the 'rearmost end of the rod 15 there is a. switch, comprising a fixed contact 24:, and a movable contact 25, both inclosed in acasing 26 provided-With ears 27, whereby the casing may be moved and set at different` positions lengthwise of the rod 15 to provide for Vehicles of different lengths, the movable contact being carried, as shown, by one arm 28 of a' bell crank, the other arm 29 of which extends through a slot in the casing. `The bell era-nk is mounted on a pin 30, and is acted upon by a spring 31 to normally hold the bell Crank to its normal position out`of engagement With the fixed contact, which spring also serves to hold the two contacts toward each other when registering. To positively hold the movable contact in registration, I provide a shoulder 82 in the path of the movable contact over which it must ride to register with the fixed contact, and away from which the movable contact must be drawn to return to its normal position. The button 33 is provided for the convenient turning or setting of the movable contact, after having` been operated, to its 'non-ringing position.

' On one of the rear Wheels, as shown, I secure to the spokes a ringl, carrying one or more spring-pins 35, which serve to cngage the arm 29 of the bell crank and "CSet the switch, when the automobile wheel is turned. The switch is in normally broken .c'ircuit -with a battery, such as '86, or other source of electrical energy, and .a bell, such as 37, or other electrically operated sound producing instrument.

In Flig. "1 the alarm is shown in its normal condition, with the switch out of the path of travel of the pins on the automobile wheel. In order to set the alarm, it is only necessary to push the push-rod rearwardly until it is held by the spring bolt of the lock. This nioveinent of the push i'odinoves rearwardly the rod carnving the switch to such a position Whei'ein the long arm Of the hell crank of the switch will be in the path of the pin on the antomobile Wheel. Vhen thus set it is obvions that upon a movement of the antcambile the pin on the autmobile wheel Will engage the long ann of the switch and move the short arm thereof, carizving' a movable contact into engagenient with a fixed contact Where the movable contact will he held by the shoulden 32, and thus-sound an alarm, which Will'continue until released by the key 22 free'ing the Spring bolt from the push-red and allowing the spring 2-0' to move the rod carrying the switch, to a position wherein the switch is Vout of the path of the pins on the wheel.

Having thus desoribed my invention, What I'claim as new therein and desire to secure by Letters Patent of thenited States therefore is:

.'An antomobile' theft alarm comprising an alarm device, an electric circuit including said alarm device, a normally open switch in said circu'it, an element arranged upon a movable part. of a vehicle, means fo'r mounting Said switch permitting bodily movements thereof, means for moving said switch into and out of the path of said element on a movable part of a vehicle, and a lock con-- trolling means. for the switch.mo-Vin;` means, In testimony whereof, I have signed my na'nie to this'specification, in` preence of two subscribing witn'esses.v i HENRY ALEXANDER. Witnesses z E. L. WRLLACE, EDWARD E. LONGAN. 

